ALSTOM AH116-2 – Plug-in I/O Module for Legacy ALSTOM Turbine & Plant Controls

The ALSTOM AH116-2 is a plug-in control module used across many legacy ALSTOM platforms in power generation and process plants. From my experience, it typically serves as an I/O interface card within ALSTOM racks (often found in steam/gas turbine control cabinets and balance-of-plant systems), handling field signals and passing them deterministically to the controller via the backplane. You might notice the “-2” denotes a later hardware revision, which in many cases brings incremental robustness and lifecycle updates while preserving backward compatibility.

Company’s Order Placement Process and Guarantees

Key Features

• Designed for ALSTOM legacy racks – Fits established ALSTOM control cabinets used in turbines and balance-of-plant, helping you replace like-for-like without redesign.
• Backplane integration – Communicates via the proprietary rack bus, so scan times and sequencing remain consistent with the original configuration.
• Signal handling commonly used in plants – Typically supports standard analog ranges (e.g., 4–20 mA / 0–10 V) and discrete signals found in process instrumentation; exact channel mix depends on build.
• Status and diagnostics – Front indicators and onboard checks provide quick visual verification during commissioning and troubleshooting.
• Service-friendly design – Plug-in replacement with front-access wiring allows faster swap-outs, which in many cases shortens planned maintenance windows.
• Revision “-2” hardware – Later revision that typically improves noise immunity and long-term maintainability while remaining form-fit compatible.

Technical Specifications

Application Fields

The AH116-2 is typically encountered in:

• Steam and gas turbine control cabinets (governing, protection interfacing, and auxiliary systems)
• Balance-of-plant instrumentation: pumps, fans, valves, and heater controls in power stations
• Industrial steam plants and cogeneration units upgrading or maintaining ALSTOM legacy DCS
• Retrofit projects seeking drop-in replacements without requalification of wiring or logic

Advantages & Value

• Form-fit-function replacement – Keeps your existing wiring and logic intact, which usually eliminates costly re-engineering.
• Reduced downtime risk – Direct swap, proven field reliability, and known behavior in ALSTOM racks.
• Lifecycle support – Sourcing legacy modules avoids forced migrations when the rest of the system is stable.
• Technical support on demand – Pinout checks, parameter notes, and pre-shipment testing available to smooth commissioning.

Installation & Maintenance

• Cabinet standards – Install in the designated ALSTOM rack frame within a clean, ventilated control cabinet; maintain ambient typically within 0–55°C.
• Wiring & segregation – Route analog signals separately from power cables; use shielded pairs for 4–20 mA and ground shields at one point to limit noise.
• Power-down policy – Unless your platform explicitly supports hot-swap, isolate and de-energize before insertion/removal; observe ESD precautions.
• Routine checks – Verify terminal tightness and inspect connectors during outages; clean dust using dry air and avoid solvents on conformal coatings.
• Calibration/validation – For analog channels, validate scaling with a loop calibrator after replacement; document any range adjustments.
• Firmware/config – If the card holds configuration, back up and restore parameters; update only with approved rack firmware, if applicable.

Quality & Certifications

• Original ALSTOM part; CE marking is typical for supplied modules in this family
• RoHS status may vary by production year/revision; documentation can be provided on request
• Units undergo functional testing prior to shipment when requested
• Seller warranty: 12 months (365 days). OEM warranty subject to unit condition and supply source.